Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a1003cd5e6771d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 12:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 308341277166965f82e13e5552acaf64 SHA-1: 639672a556be324dcd6612599575f1fa3f3556c7 SHA-256: d2a1003cd5e6771d38cb7435a208a7e57f1b6f843c8a8f77b97fb308d096253f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URI heuristics further supports its malicious intent. The document body was unreadable, but the heuristics and URLs clearly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=learn+french+offline+app PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d9edceac999ddcc9498d6bffb183082d/lurunidamonezaje.pdfIn PDF document text
    • http://geodez.com/pliki/file/7576218030.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/98602400128.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/dejuwibujek.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/pewojatomelugunelopewe.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/20502183234.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a962064c8---wekipefugoxupomoxubafemi.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/20262284921.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/xadolaliwagasipenizugumux.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/83952559632.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d51c549ab---7007397993.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/kusagidevivegusigiwavigat.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/62048087344.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613170b80ca8c---razukesumabatu.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/92907453596.pdfIn PDF document text
    • http://www.moyekolodin.com/files/22129185730.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/97625001485.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/85394855216.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/rapojozugovofokebajer.pdfIn PDF document text
    • http://cecev.com/stockages/files/58748702682.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/73834810659.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/25988554773.pdfIn PDF document text
    • http://e-menu.hu/editor_up/23866138966.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 17512 bytes
SHA-256: 5a2b5706efad88b05fe63d97d26f36981a50c8668cb8fa45d8c13c7eaa39ab7f
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 10268 bytes
SHA-256: bafe499d26ea1a05ce9548f13bfa47319a9cf6b83e16e951fc3d4156e663f373